<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .box{
            width: 322px;
            position: fixed;
            bottom:0;
            right:0;
        }
        span{
            position: absolute;
            top:0;
            right:0;
            width:30px;
            height: 20px;
            cursor: pointer;
        }
    </style>
</head>
<body>
<div class="box">
    <span></span>
    <div class="hd" id="t">
        <img src="images/t.jpg" alt=""/>
    </div>
    <div class="bd" id="b">
        <img src="images/b.jpg" alt=""/>
    </div>
</div>
</body>
</html>